Fix the i2c frequency and default address in rsdproto board

rsdproto board support has wrong I2C frequency and wrong return value
handling.

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>

board/rsdproto/rsdproto.c

@@ -210,7 +210,7 @@ void read_RS5C372_time (struct tm *timedate)
 
 #define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
 
-	if (i2c_read (RS5C372_PPC_I2C_ADR, 0, 1, buffer, sizeof (buffer))) {
+	if (! i2c_read (RS5C372_PPC_I2C_ADR, 0, 1, buffer, sizeof (buffer))) {
 		timedate->tm_sec = BCD_TO_BIN (buffer[0]);
 		timedate->tm_min = BCD_TO_BIN (buffer[1]);
 		timedate->tm_hour = BCD_TO_BIN (buffer[2]);
@@ -231,7 +231,7 @@ int read_LM84_temp (int address)
 	unsigned char buffer[8];
 	/*int rc;*/
 
-	if (i2c_read (address, 0, 1, buffer, 1)) {
+	if (! i2c_read (address, 0, 1, buffer, 1)) {
 		return (int) buffer[0];
 	} else {
 		/*printf("i2c error %02x\n", rc); */

include/configs/rsdproto.h

@@ -92,8 +92,8 @@
 
 /* enable I2C */
 #define CONFIG_HARD_I2C        	1	/* I2C with hardware support */
-#define CFG_I2C_SPEED		400000	/* I2C speed and slave address */
-#define CFG_I2C_SLAVE		0x7F
+#define CFG_I2C_SPEED		50000	/* I2C speed and slave address */
+#define CFG_I2C_SLAVE		0x30
 
 
 /* system clock rate (CLKIN) - equal to the 60x and local bus speed */